Is turbine supercharger working properly?

[Aernov]

Is turbine supercharger behavior correct in it's current version? I have noticed that during climb it just keeps manifold pressure at a set value without moving boost lever, increasing turbine RPM on its own. I have started climbing with turbine off (boost lever full aft), until max throttle was not sufficient (MP fell below 40'') Then I have advanced boost lever to set MP back to 42'' (turbine RPM rose slightly). And that was it, during climb to 20 000 ft I have not touched the boost lever, manifold pressure remained at 42'' (it even rose to 43-44'' near 20 000 ft) and turbine rpm was rising as well (throttle was maxed out whole time, only thing I did is closing intercooler flaps). I thought (based on "experience" with P-47 by A2A Simulations) that you would need to continuously advance boost lever to keep desired MP during climb (just like throttle with geared supercharger). And at 20 000 I have tried to decrease throttle without touching boost lever, and it had no effect on engine instruments readings. Also, shouldn't it be possible to reach takeoff MP (52'') with throttle alone? Now it maxes out at around 47'' at airfield elevation of 105 ft.

[Lieuie]

I am curious about this as well.

[grafspee]

Is turbine supercharger behavior correct in it's current version? I have noticed that during climb it just keeps manifold pressure at a set value without moving boost lever, increasing turbine RPM on its own. I have started climbing with turbine off (boost lever full aft), until max throttle was not sufficient (MP fell below 40'') Then I have advanced boost lever to set MP back to 42'' (turbine RPM rose slightly). And that was it, during climb to 20 000 ft I have not touched the boost lever, manifold pressure remained at 42'' (it even rose to 43-44'' near 20 000 ft) and turbine rpm was rising as well (throttle was maxed out whole time, only thing I did is closing intercooler flaps). I thought (based on "experience" with P-47 by A2A Simulations) that you would need to continuously advance boost lever to keep desired MP during climb (just like throttle with geared supercharger). And at 20 000 I have tried to decrease throttle without touching boost lever, and it had no effect on engine instruments readings. Also, shouldn't it be possible to reach takeoff MP (52'') with throttle alone? Now it maxes out at around 47'' at airfield elevation of 105 ft.

 

It is correct behavior, turbo boost regulator keeps constant exhaust pressure, this mean that in climb when outside pressure get lower ,difference in pressure will increase between inlet and out let of turbine, this will end up with higher boost, so in cl9imb you need to retard boost lever in order to keep constant boost.

Only at very high alt you will need to advance boost lever for max power.

There was many types of turbine regulators, some of them was working in different way, DCS P-47 has this regulator modeled in certain way.

In P-47 manual for full power take off boost lever is required to be latched to throttle for max take off power.